I’ve run warstomper in gitz - makes for a fun distraction piece and the rest of the army survives a little longer - changes the threat up if paired with a mangler - two sources of big output that can split opponents attention. Not saying it’s really competitive but it adds something to your play style. Plus it looks awesome on the table. Main play is to push up 40 shoota behind, sit on objective and plink into units - shredded a unit of pinks into pieces and mopped up against tzeentch in last game and he had to ignore most of my army dealing with the massive wazzock. Fun times.